/// <summary>
/// Translates the given JSON object extracted from YouTube to its managed representation.
/// </summary>
protected virtual YouTubeAdaptiveStream TranslateAdaptiveStream(JObject input)
{
if (input == null)
{
throw new ArgumentNullException(nameof(input));
}
var result = new YouTubeAdaptiveStream
{
iTag = input.Value <int?>("itag"),
Type = input.Value <string>("mimeType"),
AudioSampleRate = input.Value <long>("audioSampleRate"),
ContentLength = input.Value <long>("contentLength"),
FPS = input.Value <int>("fps"),
Quality = input.Value <string>("quality"),
QualityLabel = input.Value <string>("qualityLabel"),
Url = input.Value <string>("url"),
FrameSize = input.ContainsKey("width") && input.ContainsKey("height")
? new Size(input.Value <int>("width"), input.Value <int>("height"))
: null
};
result.Mime = ExtractActualMime(result.Type);
// get cipher info
var cipher = input.Value <string>("cipher") ?? input.Value <string>("signatureCipher");
if (!string.IsNullOrEmpty(cipher))
{
UpdateStreamCipherInfo(result, cipher);
}
return(result);
}
/// <summary>
/// Gets invoked by <see cref="DownloadMetadata"/> to extract adaptive_fmts.
/// </summary>
protected virtual List <YouTubeAdaptiveStream> ExtractAdaptiveFormatsMetadata(List <KeyValuePair <string, string> > adaptiveFmts)
{
var list = new List <YouTubeAdaptiveStream>();
var propertySet = new HashSet <string>();
var draft = new YouTubeAdaptiveStream();
void CommitDraft()
{
if (draft?.iTag != null && draft.Url != null)
{
list.Add(draft);
}
propertySet.Clear();
draft = new YouTubeAdaptiveStream();
}
void Feed(string key, string value)
{
// check for force commit
if (key == null)
{
CommitDraft();
return;
}
// check for rotation
if (propertySet.Contains(key))
{
CommitDraft();
}
propertySet.Add(key);
// update draft
switch (key.ToLowerInvariant())
{
case "quality_label":
draft.QualityLabel = value;
break;
case "itag":
draft.iTag = int.Parse(value);
break;
case "fps":
draft.FPS = int.Parse(value);
break;
case "bitrate":
draft.AudioSampleRate = int.Parse(value) * 1000;
break;
case "type":
draft.Type = value;
var parts = value.Split(new[] { ';' }, 2, StringSplitOptions.RemoveEmptyEntries);
draft.Mime = parts[0];
break;
case "size":
var sizeRegex = new Regex(@"([0-9]+)[^0-9]+([0-9]+)");
var match = sizeRegex.Match(value);
if (!match.Success)
{
throw new GrabParseException($"Failed to parse stream size: {value}.");
}
draft.FrameSize = new Size(int.Parse(match.Groups[1].Value), int.Parse(match.Groups[2].Value));
break;
case "url":
draft.Url = value;
break;
case "s":
draft.Signature = value;
break;
}
}
UnmangleEntries(adaptiveFmts, Feed);
return(list);
}
